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Mathematics, 04.11.2020 06:50 zoolo1

In a different plan for area codes, the first digit could be any number from 4 through 7, the second digit was either 2, 3, or 4, and the third digit could be any number except 0 . With this plan, how many different area codes are possible?

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In a different plan for area codes, the first digit could be any number from 4 through 7, the second...
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